Pododermatitis (FPD): broiler foot pad quality and what really determines the outcome
Foot pad dermatitis is one of the most important welfare indicators in broiler production — and a measurable score assessed at every slaughterhouse. Learn where lesions come from, what the scoring classes look like, and what you can do to keep your flock’s results as good as possible.
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What is pododermatitis (FPD)?
Foot pad dermatitis (FPD) refers to necrotic and inflammatory lesions on the underside of broiler feet — primarily on the central pad (torus metatarsalis). Changes start with reddening and swelling, progress to erosions and ulcers, and in severe cases involve deeper tissues. A bird with painful feet moves less, visits drinkers and feeders less often, and this translates into worse production performance and genuine suffering.
Why does FPD matter to a poultry farmer?
Foot pad quality matters for two reasons. First — welfare. Council Directive 2007/43/EC requires EU Member States to monitor the prevalence of foot pad lesions at slaughter and link the results to on-farm conditions. Farmers with persistently poor scores may face reduced stocking density requirements or mandatory corrective actions. Second — economics. Broiler feet are a high-value export product (Asian markets), and FPD lesions at class 2 or above disqualify the foot from export and reduce its commercial value.
The FPD scoring system — what does slaughterhouse assessment look like?
Slaughterhouses most commonly use a three-class scale: class 0 — no lesions or minimal discolouration (skin intact); class 1 — superficial erosions, redness, no tissue loss; class 2 — deep ulcers, necrosis, scab, tissue loss. Slaughterhouse results are averaged into an FPD index for the entire batch and sent back to the farmer. Under the EU welfare monitoring system (implemented via Directive 2007/43/EC), exceeding defined thresholds may result in the permitted stocking density being reduced to 39 or 33 kg/m².
The main cause of lesions — wet litter
Excessive litter moisture is by far the most important risk factor for FPD. Wet litter in contact with foot skin causes maceration — the epidermis softens, loses its protective barrier and becomes susceptible to mechanical damage and the effects of ammonia. Ammonia, released by decomposing manure, damages tissue directly and intensifies inflammation. Research cited by EFSA shows that litter moisture above 30–35% significantly increases the risk of class 2 lesions. The most common sources of excess moisture are leaking nipple drinkers or inadequate ventilation.
Other FPD risk factors
Besides litter moisture, the following play a significant role: diet composition and gut health (diarrhoea softens litter), stocking density (more birds = more manure = faster wetting), litter material and depth, microclimate (relative air humidity, temperature), water quality, and cycle length (longer cycles mean cumulative exposure). The Aviagen Ross Broiler Management Handbook identifies litter moisture, nutrition and ventilation as three key management areas influencing FPD outcome.
What increases FPD risk in broilers?
Each of these factors can worsen the outcome on its own — combined, they amplify each other.
Wet and caked litter
Litter moisture above 30–35% significantly increases the risk of foot skin maceration. The most common causes are dripping drinkers, poor ventilation and high manure density. Check litter once a day — it should crumble in the hand, not form solid clumps.
Faulty drinkers and water leaks
Leaking nipple drinkers or drinkers set too low drip onto the litter — the fastest route to localised wetting. Regular inspection and height adjustment of drinkers is one of the cheapest ways to protect foot pads.
Inadequate ventilation
Too little air exchange allows moisture and ammonia to build up at litter level — exactly where the birds lie. Minimum ventilation at night and in cold weather is critical for litter quality.
Diarrhoea and gut health
Intestinal infections (coccidiosis, enteritis, dysbacteriosis) significantly increase the water content of droppings. Wet droppings wet the litter faster than increasing bird numbers — gut health and FPD outcome are closely linked.
High stocking density
More birds per m² means more manure and harder to keep litter dry. Exceeding 33 kg/m² without documented good FPD results is not permitted under Directive 2007/43/EC.
Poor diet composition
Diets high in sodium, potassium or poorly digestible protein increase water intake by birds and the watery nature of droppings. A nutrition consultant’s advice is justified when FPD results deteriorate despite good litter management.
How to prevent FPD — from day one of the cycle
Effective FPD prevention starts before chick placement and continues throughout the entire production cycle.
Dry litter before placement
Prepare litter from dry material (straw, wood shavings, chopped straw) at least 5–8 cm deep. Before placement, ensure moisture is below 25%. Wet starting litter is the most common cause of poor FPD results in the first weeks.
Inspect drinkers before placement
Every nipple drinker should be set to the correct height and pressure — with no visible dripping. A leak from even one drinker in 1,000 birds can wet a significant litter area within 24 hours.
Maintain minimum ventilation
Even in frost, minimum ventilation must remove water vapour from inside the house. Guideline: indoor relative humidity should not exceed 70–75%. CO₂ and humidity sensors at bird level give real insight into actual microclimate conditions.
Monitor litter and feet regularly
Check litter condition in different parts of the house daily — especially under drinkers and along walls. Assess the feet of several birds from different areas once a week to catch class 1 lesions before they progress to class 2.
Support gut health
A coccidiostat programme, probiotics, and correct nutrition reduce diarrhoea. If droppings are watery, review the diet and take samples for testing — diarrhoea is a warning sign before the litter gets wet.
Analyse FPD results from the slaughterhouse and draw conclusions
The FPD index from the slaughterhouse is hard data — compare results across cycles and houses, look for patterns (e.g. always worse in winter = minimum ventilation problem). DlaFerm.pl lets you record production cycle data so you have a results history at hand.
Frequently asked questions about pododermatitis (FPD) in broilers
What is pododermatitis (FPD) in broilers?add
Foot pad dermatitis (FPD) refers to lesions on the underside of broiler feet — from discolouration and erosions to deep ulcers. They are assessed on a three-class scale at the slaughterhouse (classes 0–2). FPD is painful for the bird, restricts its movement and is an indicator of conditions inside the poultry house.
What litter moisture level is safe for broiler foot pads?add
Litter moisture below 25–30% is generally considered safe. Above 35%, the risk of class 2 lesions rises sharply. Litter can be assessed by hand — if it can be formed into a ball and doesn't fall apart, it is too wet. Solid-matter moisture meters give precise readings.
How does FPD scoring affect permitted stocking density?add
Directive 2007/43/EC sets a standard stocking density of up to 33 kg/m². Farmers who demonstrate good FPD and other welfare indicator results for three consecutive cycles may obtain approval for up to 39 or 42 kg/m². Poor FPD results can lead to the Veterinary Inspection reducing the permitted density.
Why does diarrhoea in broilers worsen FPD results?add
Diarrhoea means watery droppings. These land on the litter, wet it quickly and create conditions that promote maceration of foot skin. Coccidiosis, enteritis and dysbiosis are common causes of diarrhoea in broilers — controlling them is a prerequisite for a good FPD outcome.
Does ventilation affect broiler foot pad quality?add
Yes — it is one of the key factors. Insufficient ventilation leads to the accumulation of water vapour and ammonia at floor level where the birds rest. Ammonia damages foot skin directly, and high humidity promotes maceration. Adequate minimum ventilation (especially at night and in cold weather) protects both litter and foot pads.
How does DlaFerm.pl help with FPD and microclimate monitoring?add
DlaFerm.pl lets you record production cycle data — placements, technical results and house observations. Integration with IoT sensors enables real-time monitoring of temperature and relative humidity, with archived data you can correlate with slaughterhouse FPD results. See also: Litter management, House ventilation, Broiler welfare.
Sources & resources
- linkEFSA — Scientific Opinion on the influence of genetic parameters on the welfare and the resistance to stress of commercial broilers (2010)
- linkAviagen — Ross Broiler Management Handbook (current edition)
- linkCouncil Directive 2007/43/EC — minimum rules for the protection of chickens kept for meat production
- linkEFSA — Welfare of broilers: foot pad dermatitis indicators (scientific review)
- linkAviagen — Broiler Performance Objectives (Ross 308 technical data)
- linkEUR-Lex — Commission Delegated Regulation 2017/1940 on welfare indicators for broiler chickens
Monitor microclimate and litter with DlaFerm.pl
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